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First if you have the rewriteengine On (and you should, because if not your redirect won't work at all) at the top of your htaccess, you don't need it in every ifmodule.

If you use the rewritebase rule, use it on top so ti applies to all the rules, without repeating over and over. Maybe I'm seeing jsut a bunch of your code, but I don't see the added value of having so many ifmodules...

Hi Vac, send me a private message and in m y free time I'll be glad to help you, if I can condense the redirects in just one or two rules I'll definitely do that. However I think you don't have to redirect all your 404s. (further reading here)

It's natural for a site to have 404s you need to redirect only pages which are actually going elsewhere (as the redirect term indicates), for expired content or not available pages, you'll better create a customized 404 page to help UX on your site.

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